I have come across a few in the past. The one that stands out the most was a 1971 RSSS 396 {402) Camaro. I had it documented and also found the original block that someone saved. The story was the wrist pin came loose and scored the one cylinder. Instead of sleeving it back then a 1969 396 was put in. The car had cragers on it and was pretty much original looking. Including no spoiler, turbo 400 but the weirdess option was a column shifter. I sold the car because I didn't like the way it handled nose heavy, plus my old Amx would of blown the doors off it, so I sold it to by a Javelin AMX. Garry